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Stoichiometry

Total questions: 25

Worksheet time: 21mins

Name
Class
Date
1.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
2.
True or False. You must convert grams to moles to do stoichiometry.
a)
True
b)
False
3.
What is a Excess Reagent?
a)
amount you end with
b)
what you run out of first
c)
what you have left over
d)
what you start with
4.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
5.

What is the unit measure of a mole?

a)

Mole

b)

Mol

c)

Mal

d)

Mall

6.

What is Avadogrado's Hypothesis

a)

Equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

b)

Equality

c)

Avocado's theory that there are no equal equations that can be different.

d)

I don't know honestly.

7.

What is the definition of Empirical Formula?

a)

A formula with the lowest whole-number ratio of compounds in a compound.

b)

The only measurement system that America hasn't taken up.

c)

A formula with the lowest whole-number ratio of elements in a compound.

d)

U.S. Standard system all da way!

8.
When two substances react to form products, the reactant which is used up is called the_____.
a)
excess reactant
b)
limiting reactant
c)
catalytic reactant
d)
determining reactant
9.
What type of reaction is represented 2H2  + O2 = 2H2O?
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Neutralization
10.
What type of reaction produces carbon dioxide and water?
a)
Neutralization
b)
Synthesis
c)
Decomposition
d)
Combustion
11.
What is Avogadro's Number? 
a)
6.02 x 1023
b)
- 6.02 1023
c)
6.02 x 1022
d)
6,020,000,000,000
12.

What is a mole ratio?

a)

An animal that burrows underground.

b)

How many moles of reactant are used up in a chemical reaction.

c)

The ratio of a reactant / product to a different one - compared by the number of particles.

d)

The process by which we multiply fractions by using numbers from a chemistry problem.

13.

What is the percent yield formula?

a)

(actual yield/theoretical yield)(100%)

b)

(100%/actual yield)(theory)

c)

There is no percent yield formula.

d)

There is one, but there isn't an answer here though.

14.

How many grams are in 7.73 moles of NaCl?

a)

476 units

b)

460grams

c)

452 grams

d)

462 Milliliters

15.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
16.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
17.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
18.
WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
a)
1
b)
2
c)
3
d)
4
19.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
20.

You have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G). If one smore takes 2 graham crackers, 2 pieces of chocolate and 1 marshmallow, how many smores can you make?

a)

5

b)

4

c)

9

d)

21

21.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
22.
O2 + CS2 --> CO2 + SO2
What coefficient would go in front of the O2?
a)
1
b)
2
c)
3
d)
4
23.
Name the given compound - Fe2(CO3)3
a)
iron (II) carbonate
b)
Iron (III) carbonate
c)
Iron carbonate
d)
Iron carbonate (II)
24.

1 Cheese + 2 Bread --> 1 grilled cheese

How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

a)

14

b)

13

c)

26

d)

28

25.
Where do you look to calculate the molar mass?
a)
avogadro's number
b)
periodic table 

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